CN101906584B - Production method of environment-friendly high-surface-quality acid-cleaning-free automobile beam steel - Google Patents
Production method of environment-friendly high-surface-quality acid-cleaning-free automobile beam steel Download PDFInfo
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- CN101906584B CN101906584B CN201010235928XA CN201010235928A CN101906584B CN 101906584 B CN101906584 B CN 101906584B CN 201010235928X A CN201010235928X A CN 201010235928XA CN 201010235928 A CN201010235928 A CN 201010235928A CN 101906584 B CN101906584 B CN 101906584B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 44
- 239000010959 steel Substances 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 26
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 7
- 230000023556 desulfurization Effects 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000007670 refining Methods 0.000 claims abstract description 7
- 238000009749 continuous casting Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 abstract description 5
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 238000003303 reheating Methods 0.000 abstract 1
- 238000005554 pickling Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 229910004283 SiO 4 Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 244000062793 Sorghum vulgare Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000019713 millet Nutrition 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
A production method of environment-friendly high-surface-quality acid-cleaning-free automobile beam steel belongs to the technical field of steel rolling. Performing KR desulfurization treatment, full-three-step converter steelmaking and LF furnace refining treatment on molten iron, and then performing continuous casting; the plate blank is coiled after reheating, rough rolling, finish rolling and laminar cooling; finally, the automobile girder steel meeting the production requirement is obtained. Therefore, on the basis of meeting the performance of the automobile girder steel, the structure of the iron scale on the surface of the automobile girder steel is controlled by optimizing the chemical components, the heating system, the rolling process and the like of the automobile girder steel, and the acid-washing-free automobile girder steel with high surface quality is produced. The acid-washing-free 510L and 610L automobile beam steel plates with the width of 1100-2100 mm and the thickness of 1.6-14.0 mm are produced by adopting a 2250mm hot continuous rolling wide strip steel rolling mill. The acid-washing-free steel plate for the automobile crossbeam, which meets the production requirement and has high surface quality, is obtained by controlling chemical components and key smelting and rolling process parameters.
Description
Technical field
The invention belongs to technical field of steel rolling, a kind of working method of environment-friendly high-surface quality and pickling-free beamsteel particularly is provided, is that a production high-quality is exempted from the production technology of pickling beam steel.
Background technology
Along with the develop rapidly of Chinese national economy, driven the prosperity of domestic communication carrier, correspondingly quickened the progress of automotive engineering and the increase year by year of demand, so automobile production producer is also increasingly high to the specification of quality of automotive sheet.And development along with heavy-duty car; The high reinforcement of steel plate for automobile girder is Development Trend; Adopt high-strength automotive frame can reduce automotive dead weight, can under the condition that does not increase automotive dead weight, increase the useful load of automobile, this helps economizing on resources and protecting environment.
Beam steel is mainly used in the parts such as vertical fine strain of millet, crossbeam, strong beam and collision bumper of making load-carrying vehicle; Thickness is generally 4.0～8.0mm; Being the steel grade that demand is big in the vehicle structure steel plate, performance index are had relatively high expectations, is one of vitals of trk carry load.It is except that the weight of bearing automobile self component, the load-carrying, also will bear multiple effect of factors such as impact in the vehicle traveling process, distortion, mass force.Therefore require automobile to have good comprehensive performances, not only have good forming property, enough intensity and toughness, good resistance to fatigue with beam steel.
Before the punching press automobile is with structural part; General earlier with the iron scale removal of acid washing method with surface of steel plate; If auto vendor directly with hot rolling automotive frame steel plate without parts such as the direct punching press automotive frames of pickling the time, can cause the iron scale of surface of steel plate to come off like this and powder, the iron scale powder art that comes off like this pollutes the environment; Influence simultaneously work-ing life of press tool and uneconomical again, have a strong impact on the production of the operation of following step of auto parts.
Save energy, protection environment, development low-carbon economy are human eternal themes.Therefore automobile factory requires beam steel to have good surface quality, satisfies and exempts from pickling, the directly requirement of punching press automotive frame, reduces the influence of automotive frame production process to environment.
Summary of the invention
The object of the present invention is to provide a kind of working method of environment-friendly high-surface quality and pickling-free beamsteel, satisfy and exempt from pickling, the directly requirement of punching press automotive frame, reduce of the influence of automotive frame production process environment.
The present invention through optimizing chemical ingredients and heating cycle and the rolling technology etc. of beam steel, controls the structure of beam steel scale on surface on the basis of satisfying the beam steel performance, the production great surface quality exempt from the pickling beam steel.Technical process is: molten iron carries out continuous casting after taking off converter steelmaking, LF stove refining processing through KR desulfurization processing, complete three again; Slab curls after cooling off through reheat, roughing, finish rolling, laminar flow; Obtain to satisfy the beam steel of production needs at last; As shown in Figure 1.Through control chemical ingredients and smelting, key process parameter such as rolling, obtained satisfied production needs great surface quality exempt from pickling steel for automobile crossbeam plate.
The present invention adopts that the wide hot tandem rolling broad strip mill production of 2250mm 1100～2100mm is wide, 1.6～14.0mm is thick exempts from pickling 510L and 610L steel for automobile crossbeam plate.
Rolling technology is: with 1200～1300 ℃ of strand heating, be 3～3.5 hours heat-up time earlier; Through Fixed width pressure, obtain needed strand width; Again through two roller roughing and four roller roughing; Between roughing and finish rolling, launch stay-warm case, it is too fast to prevent that the intermediate blank temperature from reducing; Pass through finishing train again, obtain the steel plate of required size; Through the laminar flow cooling, obtain needed performance then; Utilize crimping machine with the steel plate rolling at last; Strict control finishing temperature and coiling temperature guarantee that finishing temperature is 860～1000 ℃ in the course of hot rolling, coiling temperature is 540～600 ℃.
The smelting technology of strand according to the invention is: molten iron takes off S and the P harmful element that converter smelting process is controlled molten steel through KR desulfurization pre-treatment and complete three; Adopt LF stove refining treatment that the chemical ingredients of molten steel is controlled accurately, utilize continuous caster to obtain needed strand then.
The strand composition of said 510L beam steel be C be 0.06～0.12wt%, Si be 0.05～0.15wt%, Mn be 0.50～1.40wt%, P for＜0.02wt%, S＜0.010wt%, Cr be 0.05～0.25wt%, Nb to be 0.01～0.04wt%, Alt be＞0.02wt%, surplus is Fe.
The 610L beam steel the strand composition be C be 0.06～0.12wt%, Si be 0.05～0.15wt%, Mn be 1.20～1.70wt%, P for＜0.02wt%, S＜0.010wt%, Cr be 0.05～0.25wt%, Nb be 0.03～0.06wt%, V be 0.03～0.06wt%, Ti to be 0.01～0.02wt%, Alt be＞0.02wt%, surplus is Fe.
The present invention adopts the composition design of low-carbon (LC), is intended to improve the cold-bending property and the welding property of steel plate, adds an amount of Nb, V, Ti microalloy, utilizes it to separate out crystal grain thinning, obtains suitable armor plate strength, satisfies its use properties.Adopted the composition design of low Si, reduced in the steel billet heat-processed and between red stone cortex and matrix, form Fe
2SiO
4Amount, alleviate the pressure of dephosphorization.Add the Cr element simultaneously, increased the bonding strength of zone of oxidation, prevented Fe
3O
4In the cold bending process, peel off.
The process thought that the present invention adopts heat, high temperature rolling, low temperature to batch, heat guarantee that on the one hand the thick dephosphorization temperature of steel billet is greater than Fe
2SiO
41170 ℃ of fusing points, be equipped with the multi-pass dephosphorize by high pressure water at rough rolling step, make the Fe of billet surface
2SiO
4Remove, provide safeguard for the high temperature rolling in finish rolling stage on the other hand.In the finish rolling stage, it is broken to prevent that the FeO layer from taking place, and making it be exposed to airborne area increases greatly, changes Fe into and quicken FeO
3O
4After, change Fe again into
2O
3Therefore, also adopted the strategy of high-temperature final rolling.Batch the scheme that has adopted low temperature to batch, strengthen the speed of cooling roll the back steel plate, be used to control the eutectoid reaction of FeO on the one hand, generate plasticity good, with matrix bond black oxidation iron sheet Fe closely
3O
4, compensation is used for the loss of strength that high temperature rolling causes on the other hand, obtains the beam steel that surface quality is good and over-all properties is excellent, reaches the request for utilization of exempting from pickling.
Description of drawings
Accompanying drawing 1 is a kind of technical process of working method of environment-friendly high-surface quality and pickling-free beamsteel.
Embodiment
Embodiment 1
With molten iron through the KR desulfurization handle, complete three take off converter, LF stove refining processing after, carry out continuous casting again; Its slab smelting component: C is that 0.08wt%, Si are that 0.10wt%, Mn are that 1.20wt%, P are that 0.008wt%, S are that 0.004wt%, Cr are that 0.15wt%, Nb are that 0.03wt%, Alt are 0.04wt%.
With 1260 ℃ of slab heating, be 3.2 hours heat-up time, and finishing temperature is 890 ℃, and coiling temperature is 580 ℃; Through after roughing, finish rolling, the laminar flow cooling, curl like this.Obtain the 510L beam steel at last.Ys is that 410MPa, tensile strength are that 540MPa and unit elongation are 32%, and thickness is that 8.5mm, width are 1822mm.
Embodiment 2
With molten iron through the KR desulfurization handle, complete three take off converter, LF stove refining processing after, carry out continuous casting again; Its slab smelting component: C is that 0.09wt%, Si are that 0.10wt%, Mn are that 1.46wt%, P are that 0.008wt%, S are that 0.004wt%, Cr are that 0.15wt%, Nb are that 0.045wt%, V are that 0.047wt%, Ti are that 0.015wt%, Alt are 0.034wt%.
With 1260 ℃ of slab heating, be 3.5 hours heat-up time, and finishing temperature is 880 ℃, and coiling temperature is 560 ℃; Through after roughing, finish rolling, the laminar flow cooling, curl like this.Obtain the 610L beam steel at last.Ys is that 535MPa, tensile strength are that 640MPa and unit elongation are 25%, and thickness is that 9.8mm, width are 1732mm.
Claims (2)
1. the working method of an environment-friendly high-surface quality and pickling-free beamsteel is characterized in that technology is:
With molten iron through the KR desulfurization handle, complete three take off converter, LF stove refining treatment after, carry out continuous casting again; Its slab smelting component: C is that 0.08wt%, Si are that 0.10wt%, Mn are that 1.20wt%, P are that 0.008wt%, S are that 0.004wt%, Cr are that 0.15wt%, Nb are that 0.03wt%, Alt are 0.04wt%;
With 1260 ℃ of slab heating, be 3.2 hours heat-up time, and finishing temperature is 890 ℃, and coiling temperature is 580 ℃; Through after roughing, finish rolling, the laminar flow cooling, curl like this, obtain the 510L beam steel at last; Ys is that 410MPa, tensile strength are that 540MPa and unit elongation are 32%, and thickness is that 8.5mm, width are 1822mm.
2. the working method of an environment-friendly high-surface quality and pickling-free beamsteel is characterized in that technology is:
With molten iron through the KR desulfurization handle, complete three take off converter, LF stove refining treatment after, carry out continuous casting again; Its slab smelting component: C is that 0.09wt%, Si are that 0.10wt%, Mn are that 1.46wt%, P are that 0.008wt%, S are that 0.004wt%, Cr are that 0.15wt%, Nb are that 0.045wt%, V are that 0.047wt%, Ti are that 0.015wt%, Alt are 0.034wt%;
With 1260 ℃ of slab heating, be 3.5 hours heat-up time, and finishing temperature is 880 ℃, and coiling temperature is 560 ℃; Through after roughing, finish rolling, the laminar flow cooling, curl like this, obtain the 610L beam steel at last; Ys is that 535MPa, tensile strength are that 640MPa and unit elongation are 25%, and thickness is that 9.8mm, width are 1732mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010235928XA CN101906584B (en) | 2010-07-22 | 2010-07-22 | Production method of environment-friendly high-surface-quality acid-cleaning-free automobile beam steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010235928XA CN101906584B (en) | 2010-07-22 | 2010-07-22 | Production method of environment-friendly high-surface-quality acid-cleaning-free automobile beam steel |
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| CN101906584A CN101906584A (en) | 2010-12-08 |
| CN101906584B true CN101906584B (en) | 2012-06-27 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172622A (en) * | 2011-01-29 | 2011-09-07 | 首钢总公司 | Production method of black steel for 510L automobile frame |
| CN103028608A (en) * | 2011-09-30 | 2013-04-10 | 鞍钢股份有限公司 | Hot-rolled strip steel surface scale component and thickness control method |
| CN102345064A (en) * | 2011-10-14 | 2012-02-08 | 首钢总公司 | Strip steel and production method and system thereof |
| CN102345065A (en) * | 2011-10-14 | 2012-02-08 | 首钢总公司 | Strip steel for bridge and production method and system thereof |
| CN102367503B (en) * | 2011-10-31 | 2013-10-30 | 首钢总公司 | Method for controlling contents of phosphorus, sulfur and hydrogen in molten steel |
| CN102337459A (en) * | 2011-10-31 | 2012-02-01 | 首钢总公司 | Steel for electric power tower and production method thereof |
| CN102690937B (en) * | 2012-06-20 | 2014-08-27 | 武汉钢铁(集团)公司 | Production method of steel for thin-specification sand-spraying-free and shot-blasting-free structure |
| CN102899553A (en) * | 2012-09-12 | 2013-01-30 | 首钢总公司 | Novel boron-containing hot rolled coil and production method thereof |
| CN104988406A (en) * | 2015-04-23 | 2015-10-21 | 本钢板材股份有限公司 | 355Lblack surface steel for automobile frame and production method for 355L black surface steel |
| CN106853461A (en) * | 2017-03-07 | 2017-06-16 | 华北理工大学 | A kind of hot rolled steel plate production system |
| CN107829024A (en) * | 2017-10-16 | 2018-03-23 | 首钢京唐钢铁联合有限责任公司 | Ultrahigh-strength weather-resistant steel plate with more than 700MPa level and hot continuous rolling production method thereof |
| CN109722599B (en) * | 2019-01-28 | 2020-04-28 | 东北大学 | Thick-specification automobile beam steel plate with tensile strength of 750MPa and preparation method thereof |
| CN115109905B (en) * | 2022-06-28 | 2023-07-25 | 武汉钢铁有限公司 | Automobile girder steel plate with excellent surface quality and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101348843B (en) * | 2008-08-08 | 2010-11-17 | 湖南华菱涟源钢铁有限公司 | Method for producing hot-rolled steel strip for automobile beam |
| CN101549364B (en) * | 2009-05-15 | 2010-10-27 | 首钢总公司 | Method of using hot tandem rolling broad strip mill to produce steel plate for ship hull structure use |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Co-patentee after: Shougang Jingtang United Iron & Steel Co., Ltd. Patentee after: SHOUGANG GROUP Co.,Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Co-patentee before: Shougang Jingtang United Iron & Steel Co., Ltd. Patentee before: SHOUGANG Corp. |
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